Threat Description

Z-90

Details

Aliases: Z-90
Category: Malware
Type: Virus
Platform: W32

Summary



Z-90 activates in July and December if an infected file is executed and the time is exactly 09:03. At this time the virus encrypts the DOS boot sector of drive C:, making the PC unbootable (encryption is done by XORing with 16-bit hex value 0903). After this it displays this message:

VIRUS Z-90. JUNIO 95. M
        EXICOSE MURIO TU DISCO
        DUROTU LO PUEDES RE
        VIVIRHAS BAILADO ALGUNA VEZ CON TU NOVIA A LE TENUE LUZ DE LA
		

Z-90 was found in the wild in Brazil in April 1996.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.








Description Created: Peter Szor, F-Secure, 1996


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